Rod connection and cross head guide



Sept. 5, 1939. H. o. HEDGES 2,171,554

ROD commcnou AND CROSS HEAD GUIDE Filed Jan. 11, 1957 2 Sheets-Sheet 1 INVENT /4R/?Y 0. #5 655 OR M f/QMWW ATTORNEYS.

Sept. 5, 1939. H. o. HEDGES ROD CONNECTION AND CROSS HEAD GUIDE Filed Jan. 11, 1937 v 2 Sheets-Sheet 2 INVENTOR. HHRRY 0. H0c5 Y WQJM A TTORNEYS.

Patented Sept. 5', 1939 UNITED STJATE Harry 0. Hedges,

Application was." 11, rest. Serial No.

Sch-line.

' This invention relates to. improvements in engines and it has reference moreparticularly to engines of those reciprocating piston types wherein the piston has a rod fixed thereto and con- 5 .nected to the throw of a crank shat-t through the mediacy of an oscillating connecting rod; it being the principal object this invention to pro- 'vide means for connecting the pistonnrod and connecting rod in a, more economical and more 10 practical manner with reference to assembly or 'disassembly of the parts. Also, to eifect this connection by means of a wrist pin which is designed to serve additionally as across head member for guidingfthe travel of the connectedparts,

1 and for resisting those lateral forces thatresult from. the application of power from the piston rod to the connecting rod.

More specifically statedit is the principal object of the present invention to provide anim- 20 proved crosshead guide and rod connection especially adapted to engines of'the kind disciosed'in my U. 8. Patent to be issued on December 22.

1936, under No.- 2,064,913.

Other Objects of the invention reside in the 85 details or construction. in the combination of parts, and in their mode of assembly, as will hereinafter be more fully described. In accomplishing the above stated and other objects of the invention, I have provided the im- 80 proved details of construction. the preferred forms of which are illustrated in the accompany-- ing drawings, wherein- Fig. 1 is an axial, sectional view illustrating a piston rod and connecting rod assembly and con- 35 necting means embodying the present invention as applied to 'a'tandem. cylinder engine, 7

Fig. 2 is a cross section on line I --I in Fig. 1.. Fig. 3 isa detail illustrating the'invention as applied to, a single cylinder engine.

of the piston rod and connecting rod assembly,- particularly illustrating the'wrist pin connection and cross head guide rollers.

Fig. 5 is a'sectional detailon the line 45 F18. 4. w I

Fig. 6 is a sectional detail onthe line i-lflin ig.4.-

Referring more'in detail to the drawingsa l and I designate coaxially alined power cyloo inders of an internal combustion engine in which the present invention is embodied. Numeralsd and 1', respectively, designate pistons that are fitted for reciprocationinj the cylinders I and 'i'. A piston rod,.designated in its entirety by referv ss'snee numeral s, connects the pfstonsal and s',

Fig. 4 is an enlarged detail, partly ln-lection,

s PATENTOFFICE anus;

, SeattlefWash assignor to Hedgesllotor0ompany,8eattle was... cor-' (Cl sea-s rigidly in tandem for movement in unison, and this rod operates slidably through a packed gland I in the cylinder and wall I. Also. there is a piston rod designated in its entirety in Fig. l by reference numeral 1, that operatively connects 5 the piston 2, through cross head means presently. described, with a connecting rod'l, whereby operative connection is made in the usual manner with the throw 0' of a rotatably mounted crank shaft I. The rod I in this instance operates slid- 10 ablythrough a packing gland II in an end wall ll of the cylinder I. i One of the principal features of the present inventionv resides in the'specific means for effecting the connection between the piston rod v 'I and the connecting rod I, and this means is best illustrated in Figs. 2, 4 and 5, wherein the connecting rod 0 is shown as being equipped at the end opposite that attached to the crank shaft, with an enlarged, end bearing I, having a cross .20 bore l3 therein within which a'sleeve bushing I4 is fitted and within which bushing a .wrist pin II is contained.

The opposite end portions of the wrist pin I! extend equally beyond the bearing and the oppoways lib-of the ball bearing assemblies turn freely upon the balls Ito and are designed to serve as cross head guide rollers,- as will presently be understood.

The piston rods land I are, on .which the two pistons are rigidly fixed. The rod 3, as shownin detail in Big. 4, comprises 'a tubular sleeve is that is utilised as a spacer between the pistons 2 and 2?. Likewise. the piston rodfl comprises a tubular sleeve la which is utilised in this assembly as 'a spacer between the pistonfand thewrist pin-ll. V Thesetwospacins sleeves, Ia and 'la, are-in coaxial alinement and also coaxial of the cylinders and their pistons,

and there is anelongated. connecting bolt 2| extended through the pistons and tubular spacing sleeves, and this bolt, atits outer end, is provided with a head 2,! seated within a socket 21 in the outer face piston 2', and, at its inner end, hasathreaded ll'threadedintothewrist 58 in efiect, one rbd 40:

pin, thus to connect and tighten the parts toend of the piston rod 1 therethrough.

Q rigid assemblyof gether on the bolt, and to provldea rigid unita assembly.

By reference to Fig. 5, it will be observed that the end bearing portion 8' o l the connecting rod 8 is formed with an arcuate recess or slot 28 across the outer sideand in line with the axis of the rod, and of sufllcient size for receiving the It will also be noted that the wrist pin ii, in an area registering with this slot, is formed with a flat bottomed socket. 29, see Fig. 4, within which the end of the spacing sleeve la is firmly 'seated. Also, it {will be observed that those ends of the tubular sleeves la and 1a, which are seated against the faces 'of pistons -2 and 2',.have extended flanges, asat It, and that these flanged portions seat within sockets Ii provided therefor in the faces of thepistons, thus to glve'additional and adequate bearingsurface and eiiect a more The assembled parts are locked against any possible turning that would permit a looseness of connection, by means of a short pin 35 that has opposite end portions fitted in registering sockets,

. 38 and 31 in'the end of the sleeve 1a and the seat of the socket 29. Also, pins 38 and 39 likewise lock the flanged ends of sleeves 3a and-1a to the piston 2 and a pin 40 looks the outer end flange 30 of sleeve in to the piston 2, and a locking washer is interposed between the head "25 of the bolt 25 and the base of the piston socket 21 in which the bolt head26 is located. In view of the fact that the pistons'are thuslocked against turning relative to the sleeves/and in view also of thefact that the sleeve la is locked against turning in the wrist pin socket, and since the'head of the bolt is locked in its piston socket, it is apparent that there can be no possibility of the bolt turning and permitting any looseness to result in the assembly at As shown in Fig. 6,"a set screw 45 is threaded ontothe wrist pin. This screw extends into an arcuate slot or recess 46 in the bearing 8' and its purpose is to keep thespin from turning in the bearing prior to assembly of parts, to a-position that would make it difllcultto locate the threaded socket into which the'end of bolt 25 is to be threaded-1 It-is to be understood that in the case of aroma cylinderengine, as shown in Fig; 3, the-assembly would be the same as before described insofar as the connection with the cross head guide or wrist pin I5 is concerned. Hie diflerence would,

be that the cylinder I, piston 2' and rod 3 would be eliminated, and the connecting bolt 25 would be shortened accordingly.

Fixed to the end'of cylinder l, and here shown tobe in coaxial alinement .therewith, is a cylindrical, cross head guide housing 60 in which parallel guideways BI and II are formed and within which gu'ideways the rollers lQ-IB, respectively, are adapted to travel, as-shown in Fig. 2. These guideways are parallel with and at opposite sides of the piston rod I, and provide for the reciprocal travel of the rollers therein in the same manner 'andfor the same purpose as has been described and illustrated in the United States patent previously mentioned. Therefore, since this arrangement of rollers forms no particular part of vthe present application, .they will not be further tively resists all lateral forces that are I zused by reason of the application of power through rod 1 to the oscillating connecting rod 8 which otherwise would tend to throw the piston out of alineinent and cause detrimental and destructive wear on the rod and its packing gland.

with the present arrangement, should it be desired to disassemble the parts described, it is only necessary that the bolt 25 be unthreaded -from pin l5 and withdrawn. This disconnects -the piston assembly from the connecting rod 8 and thus permits the cylinders and their pistons to be removed and disassembled. The assembly of parts, likewise, is facilitated by reason ofthe fact that all parts may be brought into assembled relation in their cylinders prior to the con- -nection of the piston rod I with the wrist pin l5, and this is by reason of'the fact that after the parts have been brought into assembled relation, the bolt 25 may be applied and tightened, thereby to unite all. of the parts in their operating relationship.

, The present asmbly provides 'not only for quick and, easy assembly or disassemblyof parts, but also is an economical construction from the manufacturing standpoint, is durable, substantial a'ndsatisfactory in every respect.

. Having thus described my invention, what I claim as new therein and desire to secure by Let ters Patent is- In an engine, a cylinder having a piston reciprocally mounted therein and a piston rod fixed to the piston'and extending from the cylinder, a pair of cross head guides parallel with and at opposite sides of the piston rod, a crankshaft, a connecting rod mounted on the crank shaft and having an end bearing, a wrist pin fitted in the bearing and having its opposite end portions extended therefrom, guide bearings on the pin ends contained in said guideways; said bearing having an opening exposing said pin, and said piston rod being extended through said opening and solidly connected with the pin.

2. In an engine, a cylinder having a piston reciprocally contained therein, a crank shaft, a

, connecting rod operatively mounted on the crank shaft and having an end bearing, a wrist pin fitted in'the bearing and a piston rod comprising a spacing sleeve, with its opposite ends fitted to .the piston and wrist pin, and a connecting bolt extended through the piston and sleeve and threaded intossaid wrist pin and clamping the parts functionally together and pins interlocking the ends of the sleeve with the parts against which it engages to prevent relative turning.

' 3. In an engine, a cylinder having a piston reciprocally mounted therein and arpiston rod fixed to the piston and extending from the cylinderfa pair of cross head guides parallel with and at opposite sides of the piston rod, a crank shaft,-

a connecting rod mounted on the crank shaft and having an end bearing, a wrist pin fitted in the bearing and having its opposite end portions extended therefrom, de hearings in the pin ends contained in said guideways; said bearing having an opening exposing saidpin, and said piston rod comprising a tubular sleeve with one end extended through said opening and seated against the wrist pin and its opposite end seated against the end ofthe piston as a spacer, a bolt extended through the piston and sleeve and .threaded into the wrist. pin, and means locking the sleeve and boltfagainst turning.

- HARRY 0. Kansas." 

